Villarreal's 2008/2009 schedule has been released by LFP. AS.com provides it here in easy-to-read format.
Villarreal start the season out 8/31 at Osasuna. From there, the schedule continues (the second half of the season is the reverse of the first half):
3. @ Numancia
15. @ Sevilla
17. @ Real Madrid
Wow. The stretch of Sevilla, Barcelona, Madird and Valencia is going to be brutal. There is a break (Christmas) between the first Barca and Madrid matches, but that will not be fun regardless.